WO2007067216A2 - Continuous infrared furnace - Google Patents

Continuous infrared furnace Download PDF

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Publication number
WO2007067216A2
WO2007067216A2 PCT/US2006/026758 US2006026758W WO2007067216A2 WO 2007067216 A2 WO2007067216 A2 WO 2007067216A2 US 2006026758 W US2006026758 W US 2006026758W WO 2007067216 A2 WO2007067216 A2 WO 2007067216A2
Authority
WO
WIPO (PCT)
Prior art keywords
furnace
conveyor
heat transfer
treated
oriented
Prior art date
Application number
PCT/US2006/026758
Other languages
English (en)
French (fr)
Other versions
WO2007067216A3 (en
Inventor
Hans L. Melgaard
Matt Weierke
Original Assignee
Despatch Industries Limited Partnership
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38123343&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2007067216(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Despatch Industries Limited Partnership filed Critical Despatch Industries Limited Partnership
Priority to DE112006003308.5T priority Critical patent/DE112006003308B4/de
Publication of WO2007067216A2 publication Critical patent/WO2007067216A2/en
Publication of WO2007067216A3 publication Critical patent/WO2007067216A3/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/201—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace walking beam furnace
    • F27B9/202—Conveyor mechanisms therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/062—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated
    • F27B9/066—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated heated by lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein

Definitions

  • the invention is directed to a continuous infrared furnace for heating and treating work pieces, and to techniques for improving performance, reliability, and maintainability of the same.
  • Continuous infrared furnaces and ovens are widely used for in a variety of industries.
  • Materials that may be treated in a continuous infrared furnace may include painted or coated materials that require specific curing conditions, components that require heat melt solder (i.e. ball grid arrays), pre-heating metals, circuit boards, silicon wafers treated through zone-melt processes, materials for use in photovoltaic cells requiring conductive paste to be fused thereto, and any other material that one can conceive of that is can benefit from controlled infrared radiation.
  • An infrared furnace provided with the ability to convey material through the furnace may be highly useful because heating and cooling zones provided throughout the furnace can provide any desired temperature profile in a consistent manner to a high volume of material to be treated.
  • the high volume fabrication and treatment of heat processed or heat annealed devices entails many opportunities and challenges.
  • a heat transfer zone for heating a material to be treated includes an upper portion and a lower portion.
  • This embodiment includes a conveyor that transports material to be treated through the heat transfer zone along a direction of travel and a jack that allows movement of the lower portion of the heat transfer zone to allow access to the heat transfer zone.
  • the heat transfer zone may include infrared lamps to heat the material to be treated, primarily through radiant heat transfer. These infrared lamps may be, for example, quartz, silicon carbide, or tungsten halogen lamps or any lamp known in the art.
  • the conveyor may be a conveyor belt.
  • a heat transfer zone for heating a material to be treated includes an upper portion and a lower portion.
  • This embodiment includes a conveyor that transports material to be treated through the heat transfer zone along a direction of travel and a jack that allows movement of the lower portion of the heat transfer zone to allow access to the heat transfer zone.
  • This embodiment may also include an air mover and a condenser with a heat transfer element.
  • the air mover may be a fan, an eductor, or any device known in the art.
  • the heat transfer element of this embodiment is removable from the condenser for cleaning and maintenance.
  • a heat transfer zone for heating a material to be treated includes an upper portion and a lower portion.
  • This embodiment includes a conveyor that transports material to be treated through the heat transfer zone along a direction of travel and a jack that allows movement of the lower portion of the heat transfer zone to allow access to the heat transfer zone.
  • This embodiment has conveyor supports that are oriented more parallel than perpendicular to the direction of travel of the conveyor.
  • the conveyor supports may be oriented slightly skew to the direction of travel.
  • the conveyor supports may also be oriented so as to allow radiation from lamps on the other side of the conveyor supports to receive consistent radiation from those lamps across the surface of the material to be treated that is exposed to those lamps.
  • Another embodiment of a furnace in accordance with the invention has a heat transfer zone for heating a material to be treated, a cooling zone for cooling the material to be treated, a conveyor that transports material to be treated through the heat transfer zone and cooling zone along a direction of travel, and a radiant cooler in the cooling zone that uses water at a pressure of 60 psig or higher as a cooling medium.
  • Yet another embodiment of a furnace in accordance with the invention has a heat transfer zone for heating a material to be treated, a cooling zone for cooling the material to be treated, a conveyor that transports material to be treated through the heat transfer zone and cooling zone along a direction of travel, and a radiant cooler in the cooling zone that uses water at a pressure of 60 psig or higher as a cooling medium.
  • the radiant cooler is black anodized to aid in radiant heat transfer to the radiant cooler.
  • a furnace in accordance with the invention has a heat transfer zone for heating a material to be treated, a conveyor that transports material to be treated through the heat transfer zone along a direction of travel, and conveyor supports that are oriented more parallel than perpendicular to the direction of travel of the conveyor, wherein the conveyor supports are oriented slightly skew to the direction of travel.
  • a furnace in accordance with the invention has a heat transfer zone for heating a material to be treated, a conveyor that transports material to be treated through the heat transfer zone along a direction of travel, and conveyor supports that are oriented more parallel than perpendicular to the direction of travel of the conveyor, wherein the conveyor supports are oriented slightly skew to the direction of travel.
  • the conveyor supports may be oriented to allow consistent radiation to the material to be treated from lamps on the other side of the conveyor supports from the material to be treated.
  • Figure 1 is a side view of an embodiment of a furnace in accordance with the invention.
  • Figure 2 is a top plan view of an embodiment of a furnace 10 in accordance with the invention.
  • Figure 3 is a cross section of a top plan view of an embodiment of a radiant cooler in accordance with the invention.
  • Figure 4 is a side view of an embodiment of a condenser in accordance with the invention.
  • Figure 5 is an end view of an embodiment of an oven in accordance with the invention.
  • Figure 6 is perspective view of an embodiment of a conveyor in accordance with the invention.
  • FIG. 1 is a side view of an embodiment of a furnace in accordance with the invention.
  • the furnace 10 has a heat transfer zone generally indicated at 20 for heating a material to be treated (not shown).
  • the heat transfer zone 20 has an upper portion 30 and a lower portion 40.
  • a conveyor 50 transports material to be treated through heat transfer zone 20 along a direction of travel.
  • the conveyor 50 may be, for example, a conveyor belt, a walking beam, or other conveyor known in the art.
  • a jack 60 allows movement of the lower portion 40 of the heat transfer zone 20 to allow access to the interior of the heat transfer zone 20 and to components therein.
  • a jack 60 means a device for raising and lowering objects by means of force applied with a lever, screw, hydraulic press, or other means known in the art.
  • the heat transfer zone 20 may also include one or more infrared lamps 70. These infrared lamps may be, for example, quartz, silicon carbide, or tungsten halogen lamps or any lamp known in the art.
  • the lowering of the lower portion 40 of the heat transfer zone 20 by the jack 60 may allow, for example, for cleaning of the lower portion 40 without interference by the conveyor 50, more simple access for maintenance of other elements of the furnace 10, such as replacing lower lamps 70 or other elements of the furnace 10.
  • the access to the interior of the furnace 10 provided by moving the lower portion 40 of the furnace from the bottom of the furnace may allow for, among other things, maintenance or replacement of insulation, lamps, the conveyor, and other elements not easily accessible without moving the lower portion. Access to the lower portion 40 of the furnace also allows for the removal of material to be treated that has fallen from the conveyor 50, broken during processing, or otherwise collected in the lower portion 40 of the furnace.
  • Figure 2 is a top plan view of an embodiment of a furnace 10 in accordance with the invention.
  • the embodiment of Figure 2 may include conveyor supports 110 that support the conveyor 50 (shown in Figure 1).
  • the conveyor supports 110 may, for example, be quartz rods or other material known in the art designed to withstand the severe environment within the furnace 10.
  • the conveyor supports 110 shown in the embodiment in Figure 2 span between cross supports 130. Viewing this figure from left to right, the conveyor supports 110 are oriented in a repetitive converging fashion. That is, beginning at any particular cross member 130 and moving from left to right, the conveyor supports 110 are initially further spaced from each other and converged toward each other as you move toward the next cross support 130 to the right. In the exemplary embodiment shown in Figure 2, this pattern repeats itself through the furnace 10.
  • conveyor supports 110 By orienting the conveyor supports 110 in this fashion it is possible to increase the uniformity of the infrared radiation reaching the work pieces from the lower infrared lamps 70.
  • conveyor supports hi many prior art furnaces, conveyor supports are parallel to the direction of travel of the work pieces and are between the lower infrared lamps and the work pieces. These conveyor supports interfere with radiant heat transfer to the portion of the work pieces that is "shadowed" by these conveyor supports. This can result in inconsistent heating or treatment of work pieces.
  • embodiments of a furnace in accordance with the invention allow more consistent exposure of the work pieces to the infrared lamps on the other side of the supports.
  • Embodiments of a furnace in accordance with this invention may also include a cooling zone generally indicated at 120.
  • Cooling zone 120 may include a radiant cooler 140 to allow removal of heat from the work pieces.
  • FIG. 3 is a cross section of a top plan view of an embodiment of a radiant cooler in accordance with the invention.
  • the radiant cooler 130 has an inlet 140 and outlet 150 to allow a cooling medium to pass through the body of the radiant cooler 130.
  • the radiant cooler 130 may be made of any material and may be coated with a non-reflective coating to enhance radiant heat transfer from the material to be treated to the radiant cooler, hi one exemplary embodiment of the invention, the radiant cooler is made of aluminum and is black anodized to enhance heat transfer.
  • FIG 4 is a side view of an embodiment of a condenser in accordance with the invention.
  • a furnace 10 in accordance with this invention may also include a condenser 90 having an air mover 80 and a heat transfer element 100.
  • the air mover 80 may be a fan, an eductor, or any device known in the art.
  • the condenser 90 may, for example, be mounted on the furnace 10 (not shown) using a flange 160.
  • the air mover 80 may draw air through the furnace 10 to create a slight negative pressure within the furnace.
  • the furnace may contain a controlled or inert atmosphere or simply ambient air.
  • a controlled atmosphere that may be contained within the furnace may include a low or high oxygen atmosphere, a controlled humidity atmosphere, an atmosphere rich in any relevant gas or vapor, or other such atmosphere as may be required based on specific processing applications.
  • Volatile materials driven from the work pieces are drawn through the air mover 80 into the condenser 90 so that, as possible, they may be condensed and recovered rather than released to the atmosphere.
  • the condensed material may drain from the condenser 90 through a drain line 170 to a collection vessel 180.
  • the condenser 90 has a heat transfer element 100 which may be removed from the condenser 90 for cleaning, maintenance, or replacement.
  • FIG. 5 is an end view of an embodiment of an oven in accordance with the invention.
  • the oven 10 of Figure 5 has an upper portion 30 and a lower portion 40.
  • Jacks 60 allow for the lowering of the lower portion 40 to provide access to the interior of the oven 10.
  • the access to the interior of the furnace 10 provided by moving the lower portion 40 of the furnace from the bottom of the furnace may allow for, among other things, maintenance or replacement of insulation, lamps, the conveyor, and other elements not easily accessible without moving the lower portion.
  • Access to the lower portion 40 of the furnace also allows for the removal of material to be treated that has fallen from the conveyor, broken during processing, or otherwise collected in the lower portion 40 of the furnace.
  • FIG. 6 is perspective view of an embodiment of a conveyor in accordance with the invention.
  • the conveyor 50 of this embodiment is commonly referred to as a walking beam.
  • the conveyor 50 conveys material to be treated (not shown) by repetitive moving of the material along one or more stationary beams 200.
  • a top frame 210 having at least one moving beam 220 is supported by base frame 190.
  • An actuator 230 moves the top frame in a vertical direction indicated by arrow "A" and a horizontal direction indicated by arrow "B.”
  • a material to be treated (any number of individual items) may be placed on the stationary beam(s) 200.
  • the actuator 230 moves the top frame 210 and the moving beams(s) 220 upward until it contacts the material to be treated and engages it enough to move it along the stationary beam(s) 200, possibly lifting it completely from the stationary beam(s) 200.
  • the actuator 230 then advances the material to be treated along the conveyor 50 by moving the top frame 210 and the moving beam(s) 220 horizontally along a direction of travel.
  • the actuator 230 then lowers the top frame 210 and the moving beam(s) 220 so that the material to be treated rests on the stationary beam(s) 200.
  • the actuator 230 then moves the top frame
  • the conveyor 50 may move a material to be treated through an oven 10 by repeatedly advancing it along the stationary beam(s) 200.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
PCT/US2006/026758 2005-12-08 2006-07-11 Continuous infrared furnace WO2007067216A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112006003308.5T DE112006003308B4 (de) 2005-12-08 2006-07-11 Infrarotdurchlaufofen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/297,213 US7514650B2 (en) 2005-12-08 2005-12-08 Continuous infrared furnace
US11/297,213 2005-12-08

Publications (2)

Publication Number Publication Date
WO2007067216A2 true WO2007067216A2 (en) 2007-06-14
WO2007067216A3 WO2007067216A3 (en) 2007-11-22

Family

ID=38123343

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/026758 WO2007067216A2 (en) 2005-12-08 2006-07-11 Continuous infrared furnace

Country Status (3)

Country Link
US (1) US7514650B2 (de)
DE (1) DE112006003308B4 (de)
WO (1) WO2007067216A2 (de)

Cited By (2)

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WO2011130518A1 (en) * 2010-04-14 2011-10-20 Babcock & Wilcox Technical Services Y-12, Llc Heat treatment furnace
CN103499209A (zh) * 2013-09-06 2014-01-08 北京吉阳技术股份有限公司 一种应用于晶硅光伏电池生产的链式烧结炉炉膛结构及方法

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US8865058B2 (en) 2010-04-14 2014-10-21 Consolidated Nuclear Security, LLC Heat treatment furnace
CN103499209A (zh) * 2013-09-06 2014-01-08 北京吉阳技术股份有限公司 一种应用于晶硅光伏电池生产的链式烧结炉炉膛结构及方法

Also Published As

Publication number Publication date
DE112006003308T5 (de) 2008-10-23
US7514650B2 (en) 2009-04-07
WO2007067216A3 (en) 2007-11-22
US20080296283A1 (en) 2008-12-04
DE112006003308B4 (de) 2014-05-15

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